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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 180,315	$ 191,934
Unrealized Gains	2
Unrealized Losses	(96)	(80)
Estimated Fair Value	180,221	191,854
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	38,712	26,584
Estimated Fair Value	38,712	26,584
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	141,603	165,350
Unrealized Gains	2
Unrealized Losses	(96)	(80)
Estimated Fair Value	141,509	165,270
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	4,515	4,041
Estimated Fair Value	4,515	4,041
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	22,697	22,543
Estimated Fair Value	22,697	22,543
U.S. Treasuries | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	11,500
Estimated Fair Value	11,500
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	25,694	45,559
Unrealized Losses	(18)	(25)
Estimated Fair Value	25,676	45,534
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	45,329	86,860
Unrealized Losses	(70)	(40)
Estimated Fair Value	45,259	86,820
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	70,580	32,931
Unrealized Gains	2
Unrealized Losses	(8)	(15)
Estimated Fair Value	$ 70,574	$ 32,916

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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